Johnson, A. K., Baum, D. A., Tye, J., Bell, M. A., & Testa, S. M. (2003). Molecular recognition properties of IGS-mediated reactions catalyzed by a Pneumocystis carinii group I intron. Nucleic Acids Research, 31(7), 1921-34. https://doi.org/10.1093/nar/gkg280 (Original work published 2003)